Datasheet

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Interfaces

Intel

Xeon

Processor C5500/C3500 Series

Datasheet, Volume 1 February 2010

70 Order Number: 323103-001

• CRC check byte used to efficiently and atomically confirm accurate data delivery.

• Synchronization at the beginning of every message minimizes device timing

accuracy requirements.

Generic PECI specification details are out of the scope of this document and instead can

be found in RS - Platform Environment Control Interface (PECI) Specification, Revision

2.0. What follows is a processor-specific PECI client definition, and is largely an

addendum to the PECI Network Layer and Design Recommendations sections for the

PECI 2.0 Specification.

Note: The PECI commands described in this document apply to the Intel

Xeon

processor

C5500/C3500 series only. See Table 29 for the list of PECI commands supported by the

Intel

Xeon

processor C5500/C3500 series PECI client.

Note:

1. See Table 34 for a summary of mailbox commands supported by the Intel

Xeon

processor C5500/C3500

series CPU.

2.2.1 PECI Client Capabilities

The Intel

Xeon

processor C5500/C3500 series PECI client is designed to support the

following sideband functions:

• Processor and DRAM thermal management.

• Platform manageability functions including thermal, power and electrical error

monitoring.

• Processor interface tuning and diagnostics capabilities (Intel

Interconnect BIST

[Intel

IBIST]).

2.2.1.1 Thermal Management

Processor fan speed control is managed by comparing PECI thermal readings against

the processor-specific fan speed control reference point, or T

CONTROL

. Both T

CONTROL

and PECI thermal readings are accessible via the processor PECI client. These variables

are referenced to a common temperature, the TCC activation point, and are both

defined as negative offsets from that reference. Algorithms for fan speed management

using PECI thermal readings and the T

CONTROL

reference are documented in

Section 2.2.2.6.

Table 29. Summary of Processor-Specific PECI Commands

Command

Supported on

Intel

Xeon

Processor C5500/C3500

Series CPU

Ping() Yes

GetDIB() Yes

GetTemp() Yes

PCIConfigRd() Yes

PCIConfigWr() Yes

MbxSend()

Yes

MbxGet()

Yes